erc k6sb1 make abs data

so fired up the good ol ERC today to do some training and got a error message saying make abs data (see attached screen shot) the problem is in sv2 - 3 which i believe is the t axis. the robot was running fine when we shut it off last Friday. Could my robot battery have died,i would think the robot battery dieing would effect all the axis and not just one. i currently have the T motor jumpered to try to get it to reset. if that does not work any ideas on where to go next. also can i test the robot battery with out effecting the other 5 axis that are still working? and yes, i know this robot is old, we keep it around for training purposes and sometimes use it for overflow from time to time.

So jumpering the t axis motor overnight did the trick, the robot is back up and running, no alarms and no low battery warning. so what could have caused this to happen out of the blue, for what appears to be, for no reason at all?